Permanent photodoping of plasmonic gallium-ZnO nanocrystals

Abstract

The concentration of delocalized electrons in plasmonic metal oxide nanocrystals can be increased permanently by photodoping because the electron compensation becoming the dominant compensation mechanism for the aliovalent donor dopant.

Photodoping-Inspired Room-Temperature Gas Sensing by Anatase TiO2 Quantum Dots

“…The concept is inspired from photodoping of ultrasmall (quantum dot size) TiO 2 nanoparticles in hole scavenging media, where photogenerated holes are scavenged via photochemical oxidation of the alcohol while electrons populate the conduction band. , This, in turn, alter the electrical and optical properties of the TiO 2 nanoparticles. In the present case, we use the photodoping concept for detecting ethanol at room temperature in the presence of humidity.…”

Light-Induced Room-Temperature Gas Sensing by Donor-Doped Anatase TiO2 Ultrasmall Nanoparticles

“…31 Moreover, it has been demonstrated that permanent electron accumulation can be observed for ZnO nanoparticles when photodoped. 36 The electrons from photodoping remained stable in ZnO even after drying and keeping in the air for more than a month. The most responsive Ta-doped TiO 2 sample film was further studied in more detail.…”

“…Because localized electrons have less affinity toward participating in oxidation reactions, the defects in doped TiO 2 nanoparticles become relatively stable . Moreover, it has been demonstrated that permanent electron accumulation can be observed for ZnO nanoparticles when photodoped . The electrons from photodoping remained stable in ZnO even after drying and keeping in the air for more than a month.…”